code: def fw(self) -> None:
      self.out = xops.scaled_index_add(
          input=self.inp.clone(),
          index=self.index,
          source=self.src,
          scaling=self.scaling,
          alpha=self.alpha,
      )
  
file_path: xformers/xformers/benchmarks/benchmark_indexing.py
imports: import random
  import torch
  from utils import DTYPE2STR, benchmark_main_helper2, product_dict
  import xformers.ops
label_desc: Use image node_id 2 for calling the ScaledIndexAddBenchmark obj's underlying member method code with example usage: obj.fw() without return types